Collecting plate and battery adopting same

Abstract

The utility model discloses a current collecting disc and a battery with the same, the current collecting disc comprises a welding plate, a fixing groove and a pole button, the pole button is of an annular structure and is arranged on the welding plate, and the fixing groove is arranged on the welding plate on the inner side of the pole button. The flow collecting disc is of an integrated structure formed through extrusion, the machining difficulty is small, and the production efficiency is high; the current collecting disc adopts a hollow design, so that the proportion of structural parts can be greatly reduced, the use of adapter plates is reduced, and the installation and fixation of the electrode and the roll core cooling structure are also considered; the expansion of the roll core can be inhibited by adjusting the wall thickness of the shell in different widths, the energy density is improved, and the cycle life of the battery is prolonged; the shell is provided with the anti-explosion valve and the liquid injection hole structure, the electrolyte in the battery can be conveniently supplemented by utilizing the liquid injection hole, and the battery shell can be prevented from being damaged due to overlarge internal pressure when the roll core is excessively expanded through the anti-explosion valve.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery technology, and in particular relates to a current collector and a battery using the current collector. Background Technology

[0002] With the increasing severity of energy and environmental issues, countries around the world have intensified their research and development efforts in new energy vehicles. As a crucial component of electric vehicles, the research on power batteries is imperative. Lithium-ion batteries possess the characteristic of balanced performance. Excluding upgrades in raw materials, changes in formulation and processes that improve performance in certain areas inevitably lead to a decline in performance in others. Therefore, most technologies currently on the market have reached near-theoretical levels. Further improvements require fundamental innovative design.

[0003] Batteries generate heat during prolonged use, which causes the cells to expand. This expansion leads to displacement of the cells, resulting in excessive stress at the connection between the terminals and the cells, and even breakage. The current solution is to use Z-shaped connectors to connect the cells and terminals to cope with the expansion of the cells. However, due to the limitations of its structure, the Z-shaped connector has a small connection area with the cells and terminals, limited current carrying capacity, and is prone to overheating when the current is high.

[0004] Therefore, we need to design a current collector and a battery that uses the current collector to solve these problems. Utility Model Content

[0005] The problem to be solved by the present invention is to provide a current collector and a battery using the current collector.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] The invention includes a welding plate, a fixing groove, and a pole button. The pole button has a ring-shaped structure and is disposed on the welding plate. The fixing groove is formed on the welding plate inside the pole button.

[0008] Preferably, the manifold is integrally stamped and is made of aluminum or nickel-plated copper.

[0009] This design allows the manifold to have higher mechanical strength through one-piece stamping, while the aluminum or nickel-plated copper material enables the manifold to have good electrical conductivity.

[0010] Preferably, the center point of the fixing groove, the center point of the pole knob, and the center point of the collector plate overlap each other.

[0011] Preferably, the shape of the pole knob is the same as the shape of the fixing groove, and the long side of the welding plate, the long side of the fixing groove and the long side of the pole knob are parallel to each other.

[0012] Preferably, the welding plate has a width W2 of 10-200mm, a length L2 of 10-200mm, and a thickness T6 of 0.2-1.8mm; the pole button has a width W3 of 0.5-3mm, a height H2 of 1-10mm, and a fixing groove with a length of 10-200mm and a width of 2.5-200mm.

[0013] This configuration ensures precise installation and fit with other components.

[0014] A battery includes a casing, a winding core, terminals, and a current collector. The winding core is located inside the casing, the terminals are disposed on the casing and have insertion slots, the current collector is located between the terminals and the winding core, and the electrode knob on the current collector is located in the insertion slot on the terminals.

[0015] Preferably, the width of the insertion slot is the same as the width W3 of the pole button, and the depth of the insertion slot is not less than the height H2 of the pole button.

[0016] This configuration, by adjusting the width, ensures that the collector plate remains in close contact with the pole when it moves, thus ensuring conductivity between the core and the pole.

[0017] Preferably, the two ends of the winding core are respectively provided with tabs, and the tabs are fixed to the collector plate by laser welding.

[0018] This configuration ensures the reliability of the connection between the core and the collector plate, preventing breakage at the connection point when the core moves.

[0019] Preferably, the thickness of the pole post is greater than the thickness of the housing, the housing is connected to the middle of the side wall of the pole post, and the pole post and the housing are insulated from each other.

[0020] This design can prevent short circuits from occurring in the battery casing after the terminals move and the casing or collector plate moves, which could damage the battery or even cause a fire.

[0021] Preferably, the electrode post is made of aluminum or a copper-aluminum composite material.

[0022] This configuration ensures that the electrode has high conductivity.

[0023] The advantages and positive effects of this invention are:

[0024] The current collector of this invention is an integrated structure formed by extrusion molding, which is easy to process and has high production efficiency. By setting a terminal button on the current collector and connecting it to the insertion groove on the terminal post through an insertion method, when the core heats up and expands during use, it will push the current collector closer to the terminal post, and the terminal button will move into the insertion groove. When the core temperature decreases and it contracts, it will move the current collector away from the terminal post, and the terminal button will move out of the insertion groove. In this way, the stability of the connection between the current collector and the terminal post is ensured, ensuring that the current can be transmitted stably. At the same time, it can avoid problems such as deformation of the battery shell and damage to the battery's sealing structure caused by excessive pressure on other components due to core expansion. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the collector disk structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the longitudinal section of the collector plate of the present invention;

[0028] Figure 3 This is a schematic diagram of the cross-section of the collector plate of the present invention;

[0029] Figure 4 This is a schematic diagram of the overall assembly structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the assembly structure of the core and the shell of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the housing of the present invention;

[0032] Figure 7 This is an exploded view of the end cap assembly of the present invention;

[0033] Figure 8 This is a schematic cross-sectional view of the end cap assembly of the present invention after assembly;

[0034] Figure 9 This is a schematic diagram of the liquid-conducting core rod structure of the present invention;

[0035] Figure 10 This is a schematic diagram showing the positions of the liquid guiding hole and the positioning hole of the present invention;

[0036] Figure 11 This is a cross-sectional schematic diagram of the positive or negative electrode sheet of the present invention;

[0037] Figure 12 This is a schematic cross-sectional view of a stacked structure of the front layer of the core winding according to the present invention;

[0038] Figure 13 This is a schematic diagram of the electrode structure in one embodiment of the present invention;

[0039] Figure 14 This is a schematic diagram of the position structure of the tabs and the cutting area in another embodiment of the present invention;

[0040] Figure 15 This is a schematic diagram of the angle of the cutting area.

[0041] The annotations in the attached figures are explained as follows:

[0042] 1. Shell; 11. Injection hole; 12. Explosion-proof valve; 2. End cap assembly; 21. Electrode post; 211. Mounting groove; 212. Insertion groove; 213. Splicing ring; 214. Connecting groove; 22. First insulating component; 23. Core rod welding platform; 231. Core rod hole; 232. Welding shoulder; 233. Splicing groove; 24. Second insulating component; 25. Cover plate body; 251. Through groove; 26. Lower plastic; 3. Collector plate; 31. Welding plate; 32. Electrode knob; 33. Fixing groove; 4. Liquid guiding core rod; 41. Liquid passage hole; 42. Positioning hole; 5. Core winding; 51. Electrode tab; 52. Cutting area; 531. Positive electrode sheet; 532. Negative electrode sheet; 533. Diaphragm; 5301. Current collector layer; 5302. Active material layer. Detailed Implementation

[0043] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, in the embodiments and claims, unless otherwise specified, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve terms such as "first," "second," etc., they are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0047] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0048] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0049] The present invention will be further described below with reference to the accompanying drawings:

[0050] like Figures 1-3 As shown, a collector plate structure includes a welding plate 31, a fixing groove 33, and a pole button 32. The pole button 32 is an annular structure and is disposed on the welding plate 31. The fixing groove 33 is formed on the welding plate 31 inside the pole button 32.

[0051] The manifold 3 is integrally stamped, which gives it higher mechanical strength. It is made of aluminum or nickel-plated copper, which gives it good electrical conductivity.

[0052] The center points of the fixed groove 33, the pole knob 32, and the collector plate 3 overlap, which ensures the installation and fit accuracy with other components.

[0053] The shape of the pole knob 32 is the same as the shape of the fixing groove 33.

[0054] In this embodiment, the welding plate 31 has a width W2 of 10-200mm, a length L2 of 10-200mm, and a thickness T6 of 0.2-1.8mm; the pole button 32 has a width W3 of 0.5-3mm, a height H2 of 1-10mm, and a fixing groove 33 has a length of 10-200mm and a width of 2.5-200mm.

[0055] like Figures 4-13 As shown, a battery includes a housing 1, a winding core 5, a terminal post 21, and the aforementioned current collector 3. The winding core 5 is located inside the housing 1, the terminal post 21 is disposed on the housing 1, and the terminal post 21 is provided with a insertion groove 212. The current collector 3 is located between the terminal post 21 and the winding core 5, and the electrode button 32 on the current collector 3 is located in the insertion groove 212 on the terminal post 21.

[0056] Specifically, the shell 1 is formed by extrusion profile, and the material can be any one of aluminum alloy, steel, copper alloy, or magnesium alloy. In this embodiment, the shell is prismatic in shape. Figure 1 As shown, the length L1 of the casing 1 satisfies 10mm≤L1≤2000mm, the width H1 satisfies 10mm≤H1≤400mm, and the thickness T1 satisfies 10mm≤T1≤200mm. The wall thickness T2 of the narrow side and the wall thickness T3 of the wide side of the casing 1 satisfy 0.2mm≤T2≤8mm and 0.2≤T3≤8mm, respectively, and the ratio of T2 to T3 is 1 / 2. This setting is because the winding core 5 inside the battery casing 1 will expand during repeated charging and discharging. The expanded winding core 5 will squeeze the casing 1, causing the casing 1 to deform. Therefore, the strength of the casing 1 is increased by adjusting the wall thickness of the wide side of the casing 1. The radius R1 of the arc corner of the casing 1 satisfies 0mm≤R1≤100mm, and the length of the casing 1 can be arbitrarily cut according to the configuration requirements of the battery cell capacity.

[0057] Specifically, the liquid guiding core rod 4 has a positioning hole 42 and several liquid passage holes 41 through it along its length. The liquid passage holes 41 are symmetrically distributed along the positioning hole 42, and the positioning hole 42 has a circular cross-section, while the liquid passage holes 41 have an elongated cross-section. In this embodiment, the length L4 of the liquid guiding core rod 4 satisfies 10mm≤L4≤2000mm, the width H4 satisfies 10mm≤H4≤400mm, and the thickness T4 satisfies 3mm≤T4≤200mm; the width H5 of the liquid passage hole 41 satisfies 1mm≤H5≤160mm, and the height T5 satisfies 1mm≤T5≤160mm; the radius R4 of the arc on both sides of the liquid guiding core rod 4 satisfies 0mm≤R4≤100mm, and the angle of R4 is 10°-180°; the radius R3 of the positioning hole 42 satisfies 1mm≤R3≤100mm; the ratio of the surface area S (unit cm2) of the liquid guiding hole on the liquid guiding core rod 4 to the capacity Q (unit Ah) of the core 5 is 0.5-5. This setting can not only greatly reduce the proportion of structural components, but also ensure that the heat conduction efficiency of the coolant flowing through the liquid guiding hole is the highest during use.

[0058] An explosion-proof valve 12 and an injection hole 11 are provided on a narrow face of the housing 1. The injection hole 11 is used to inject electrolyte into the housing 1 after the end cap assembly 2 is sealed and connected to the housing 1. The explosion-proof valve 12 can release the pressure inside the housing 1 when the cell expands excessively to prevent the battery from exploding. The opening pressure of the explosion-proof valve 12 is 0.2-1 MPa, the valve width is 4-50 mm, the length is 4-100 mm, and it is located in the middle of the narrow face of the housing 1.

[0059] The injection hole 11 is a circular hole with a diameter of 1-10mm, and the distance between it and the explosion-proof valve 12 is 15-50mm.

[0060] The end cap assembly 2 includes a pole post 21, a first insulating component 22, a core rod welding platform 23, a second insulating component 24, a cover plate body 25, and a lower plastic component 26. The cover plate body 25 has a thickness T7 of 1-4 mm, a width of 10-200 mm, and a length of 10-400 mm. A through groove 251 is provided through the cover plate body 25, and the pole post 21 is located in the through groove 251. The pole post 21 is not limited to a rounded cuboid structure, but can also be a cylinder or other shapes, with a thickness of 0.5-3 mm and a width of 0. The diameter is 5-10mm. The positive electrode post 21 is made of aluminum, and the negative electrode post 21 is made of copper-aluminum composite material. This design ensures that the electrode post 21 has high conductivity. An installation groove 211 is provided through the electrode post 21. A splicing ring 213 is provided in the installation groove 211. A connecting groove 214 is provided on the outer wall of the electrode post 21. The connecting groove 214 is connected end to end and surrounds the electrode post 21. The cover plate body 25 is inserted into the connecting groove 214. The second insulating component 24 and the lower plastic 26 are located at the joint between the main board and the connecting groove 214.

[0061] In this embodiment, the thickness of the lower plastic 26 is 0.2-2mm, and the distance between the lower plastic 26 and the edge of the cover plate body 25 is 0-2mm, ensuring insulation between the cover plate body 25 and the pole post 21. The pole post 21 is also provided with a plug groove 212, which is connected end to end and surrounds the mounting groove 211. The width of the plug groove 212 is the same as the width W3 of the pole button 32, and the depth of the plug groove 212 is not less than the height H2 of the pole button 32 on the current collector 3. This setting, by adjusting the width, can ensure that the current collector 3 can always maintain close contact with the pole post 21 when it moves, ensuring the conductivity between the core 5 and the pole post 21. When the end cap assembly 2 is assembled with the housing 1, the pole button 32 on the current collector 3 will be inserted into the plug groove 212 on the pole post 21, and then the cover plate pole post 21 and the hollow current collector 3 pole button will be electrically connected by laser penetration welding.

[0062] The mandrel welding platform 23 is located inside the mounting groove 211. A mandrel hole 231 is provided through the mandrel welding platform 23. The cross-sectional size of the mandrel hole 231 is the same as the cross-sectional size of the liquid guiding mandrel 4. The ratio of the perimeter of the liquid guiding mandrel 4 to the perimeter of the core 5 is 1.1-10. A splicing groove 233 is provided on the outer wall of the mandrel welding platform 23. The splicing groove 233 surrounds the mandrel hole 231. The splicing ring 213 is located inside the splicing groove 233. The first insulating element 22 is located at the joint between the splicing ring 213 and the splicing groove 233, as well as the joint between the outer wall of the mandrel welding platform 23 and the inner wall of the mounting groove 211, to ensure the insulation between the pole post 21 and the mandrel welding platform 23. When the end cap assembly 2 is assembled with the housing 1, the end of the liquid guiding mandrel 4 will be inserted into the mandrel hole 231 on the mandrel welding platform 23. Finally, the welding shoulder 232 of the mandrel welding platform 23 and the liquid guiding mandrel 4 are welded together by laser welding to realize the connection between the mandrel welding platform 23 and the liquid guiding mandrel 4.

[0063] The core 5 is obtained by winding a positive electrode sheet 531, a negative electrode sheet 532, and at least two layers of separators 533, as shown below. Figure 12As shown, both the positive electrode 531 and the negative electrode 532 include a current collector layer 5301 and an active material layer 5302. The active material layer 5302 is coated on both sides of the current collector layer 5301, and uncoated active material areas S1 and S3 are reserved on one edge of the current collector layer 5301. Before winding, the positive electrode 531, the negative electrode 532, and the separator 533 need to be stacked. The stacking method is as follows: positive electrode 531, negative electrode 532, and separator 533 in the order of separator 533-positive electrode 531- The structure is either separator 533-negative electrode 532 or separator 533-negative electrode 532-separator 533-positive electrode 531. Typically, gold foil is used as the current collector layer 5301 of the positive electrode 531, and copper foil is used as the current collector layer 5301 of the negative electrode 532. Different active material layers 5302 are coated onto the current collector layer 5301 to form the positive electrode 531 and negative electrode 532 used to make the core 5. The positive electrode 531 with the active material layer 5302 coated on it has a current collector layer 5301 and a negative electrode 531. After being wound, the current collector layer 5301 forms the main body of the core 5. The areas on the current collector layer 5301 of the positive electrode 531 coated with active material and the areas on the current collector layer 5301 of the negative electrode 532 not coated with active material are wound to form racetrack-shaped tabs 51 at both ends of the main body of the core 5. The tabs 51 formed by winding the current collector layer 5301 of the positive electrode 531 are positive tabs, while the tabs 51 formed by winding the current collector layer 5301 of the negative electrode 532 are negative tabs. The positive and negative tabs... The tabs are located at both ends of the core 5, and the end faces of the positive and negative tabs need to be cut flat so that they can fit tightly with the welding plate 31 of the collector plate 3. After the end cap assembly 2 is installed into the housing 1, the positive and negative tabs on the core 5 are respectively attached to the side of the welding plate 31 on the opposite collector plate 3 that does not have the tab 32, and are fixedly connected by laser welding. This setting can ensure the reliability of the connection between the core 5 and the collector plate 3 and prevent the connection from breaking when the core 5 moves.

[0064] Reference Figure 12 The process involves stacking the separator 533, negative electrode 532, separator 533, and positive electrode 531 from bottom to top, followed by winding. After winding, part S2 becomes the main body of the core 5, part S1 becomes the negative electrode tab, and part S3 becomes the positive electrode tab. The structure of the core 5 and the tab 51 at one end after winding is as follows: Figure 13 As shown.

[0065] like Figure 14 and Figure 15As shown, in another embodiment of the present invention, the connection form between the tab 51 on the core 5 and the collector plate 3 is changed by adjusting the tab 51. When making the adjustment, the arc area of ​​the racetrack-shaped tab 51 needs to be cut. The cut area 52 is a fan-shaped area with an angle R2 of 10°-180° or a semi-circular area at the junction of the arc edge and the straight edge. The cut area is without tab 51, while the height of the uncut area 52 and the tab 51 gradually increases from the outside to the inside. The longitudinal section is trapezoidal. The total height of the tab 51 is 3-30mm, the width is 1-10mm, and a gap is reserved on the side near the liquid guiding core rod 4 to avoid contact between the tab 51 and the liquid guiding core rod 4. This setting can increase the length of the core 5, so that the tab 51 can tilt to the liquid guiding core rod 4 when connected to the collector plate 3. This not only ensures the contact area at the connection between the tab 51 and the collector plate 3, but also increases the size of the core 5 and improves the energy density of the core 5.

[0066] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A collector disk, characterized in that: It includes a welding plate (31), a fixing groove (33) and a pole button (32). The pole button (32) is a ring structure and is disposed on the welding plate (31). The fixing groove (33) is opened on the welding plate (31) inside the pole button (32).

2. A collector disk according to claim 1, characterized in that: The collector plate (3) is integrally stamped and is made of aluminum or nickel-plated copper.

3. A collector disk according to claim 1, characterized in that: The center point of the fixed groove (33), the center point of the pole knob (32), and the center point of the collector plate (3) overlap with each other.

4. A collector disk according to claim 1, characterized in that: The shape of the pole knob (32) is the same as that of the fixing groove (33), and the long side of the welding plate (31), the long side of the fixing groove (33) and the long side of the pole knob (32) are parallel to each other.

5. A collector disk according to claim 1, characterized in that: The welding plate (31) has a width W2 of 10-200mm, a length L2 of 10-200mm, and a thickness T6 of 0.2-1.8mm; the pole button (32) has a width W3 of 0.5-3mm, a height H2 of 1-10mm, and a fixing groove (33) with a length of 10-200mm and a width of 2.5-200mm.

6. A battery, characterized in that: The device includes a housing (1), a core (5), a pole (21), and a collector plate (3) as described in any one of claims 1-5. The core (5) is located inside the housing (1), the pole (21) is disposed on the housing (1), and the pole (21) is provided with a insertion groove (212). The collector plate (3) is located between the pole (21) and the core (5), and the electrode button (32) on the collector plate (3) is located in the insertion groove (212) on the pole (21).

7. A battery according to claim 6, characterized in that: The width of the insertion slot (212) is the same as the width W3 of the pole button (32), and the depth of the insertion slot (212) is not less than the height H2 of the pole button (32).

8. A battery according to claim 6, characterized in that: The core (5) is provided with tabs (51) at both ends, and the tabs (51) and the collector plate (3) are fixed to each other by laser welding.

9. A battery according to claim 6, characterized in that: The thickness of the pole post (21) is greater than the thickness of the housing (1). The housing (1) is connected to the middle of the side wall of the pole post (21), and the pole post (21) and the housing (1) are mutually insulated.

10. A battery according to claim 6, characterized in that: The pole (21) is made of aluminum or copper-aluminum composite material.

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